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- W1970139839 abstract "The objective of this research was to determine the effectiveness of soil amendments on reducing soluble P in Spodosols under dairy animal land-use. Dairy animal manure is a P source contaminating surface waters of the northern watersheds of Lake Okeechobee in south Florida. Phosphorus contamination has originated from manure-loaded soils found adjacent to milking barns, holding pens, feed lots under intensive animal use, and also developed pastures. In various batch-incubation studies, manure-loaded soils (7.0 to 120.9 g kg−1 t as total organic C) were treated alone or in combination with varying rates of calcium carbonate (to pH 7.5), gypsum (0 to 100 g kg −1 soil), ferrous sulfate (0 to 1000 mg kg −1 as Fe), and alum (0 to 1000 mg kg−1 t as Al). The influence of aerobic and anaerobic conditions on soluble P were also studied. Soluble phosphate concentrations were reduced 40 to 63% from gypsum application up to 100 mg kg−1- t soil; nitrate and soluble organic carbon concentrations were similarily reduced by 45% and 49%, respectively. Increasing water-soluble Ca and the soil pH to 7.5 decreased soluble phosphate concentrations in manure-loaded soils. Gypsum amendments were effective under a broad range of manure loading, pH, and redox conditions. Bacterial activities were also affected by gypsum-amended soils. Calcium carbonate effectiveness was limited to lower pH soils (< pH 7.0). Although Fe and Al soil amendments increased P retention to over 400% from unamended soils, source costs and questionable biological toxicities may limit their usefulness. Evidence indicated that both precipitation and microbial mechanisms are involved in P retention /desorption in soils loaded with animal manures." @default.
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- W1970139839 date "1995-11-01" @default.
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- W1970139839 title "Use of soil amendments to reduce soluble phosphorus in dairy soils" @default.
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- W1970139839 doi "https://doi.org/10.1016/0925-8574(95)00025-9" @default.
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